William martin



(No Model.)

W. MARTIN.

MECHANICAL MOVEMENT.

No. 691,102.` Patented 001;. 5,1897.

Q/Lluzgm VLAJCV@ Nrrnn STATns MIIIiIiIAM MARTIN, OF SALEM,MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO THOMAS F. LITTLE, OF SAME PLACE.

M CHANICAL MovEn/l ENT.

SPECIFICATION forming part of Letters Patent No. 591,102, dated October5, 1897. Application iiled February 19, 1897. Serial No. 624,130. (Nomodel.)

To all whoml it may concern: l Y

Be it known that I, WILLIAM MARTIN', a citi zen of the United States,residing at Salem, in the county of Essex and State of Massachusetts,have invented certain new and use ful Improvements in MechanicalMovements, of which the following is a specification, reference beinghad therein to the accompanying drawing.

My invention consists in a new and useful combination and arrangement oflevers and links whereby conveniently to apply and transmit power to thedesired part of a machine in order to communicate movement to the saidpart and lift a load of any given 'character or perform other usefulWork tend-` ing to consume power, all as presently will be describedwith reference to the accompany ing drawing. n

The distinguishing characteristics of the invention will be moreparticularly pointed out and distinctly defined in the claims at theclose of this specification.

The accompanying drawing illustrates dialgrammatically the mechanicalmovement embodying my invention and in dotted lines illustrates thepositions assumed by the parts after being moved from their lfull-lineposition.

At 1 is a lever which is intended, for instance, to be actuated by powerapplied thereto by hand, the upper end thereof being represented assuitably shaped to be grasped by the hand of the operative. Y

At 2 is the pivotal point around which the said lever turns. I haverepresented the said lever as having arranged close thereto an arc orsegment with notches 4c therein, the lever having pivoted thereto alatch 5, to which 4latter is connected a rod 6, having the upper larock-shaft, which'is shown at 17.

tion to another, the latch may be raised out of the notch 4, in which ithappens to be for the time being, through the medium of power applied byhand, to the releasing-lever 7, and when the pressure upon the saidlever 7 is released the spring 9 will act to force the said latch intothe next notch which is presented thereto in the movement of the lever.The lower arm of the lever 1 is curved or projected rearwardly or to theleft of the pivotal point, as clearly shown in the drawing, and to theextremity 'of the said lower arm of the lever 1 is joined one extremityof the curved link 11, the right-hand extremity of which is joined tothe lower arm of a lever 12,which is shown pivoted at 13 upon a smallstand 14, which is supported in any suitable manner.

The upper arm of the lever 12 is curved for the purpose which presentlywill be explained, the concave side thereof being presented toward theleft in the drawing, and the upper extremity of this arm of the saidlever 12 is joined by a curved link 15 to the upper eX- tremity of anarm 16, that is mounted upon To the rock-shaft 17 is applied the partwhich sustains the load or performs the work. In the drawing I haverepresented an armv 18 fast upon the said rock-shaft 17, and forconvenience in illustrating the idea I have shown conventionally a load19, carried by the said arm 18. The resistance or load which istransmitted to the rock-shaft 17 by the work to be done or the burden tobe supported acts or reacts in a direction to raise the lower arm `of vthe lever 12 and also carry upwardly the link 11. The said link 11 iscontemplated in practice to serve as a means of c ounterbalancing theload 19 lor the resistance applied to the said shaft 17. In practice Iapply to the said link 11 counterbalanGing-weights 20, one or more ofwhich maybe used, according to requirements. The rearward projection ofthe lower arm of the actuating-lever 1 causes a part of the weight 11 tobe'applied to the said lever 1 to the lefthand side of the fulcrum IOI)by said link 11. yThe rearward projection of the lower arm of the lever12 disposes the said arm in an approximately horizontal position whenthe load 19 is at its lowest point, and thereby enables the weightedlink 11 to act to the greatest possible-advantage in facilitating thestarting of the load in to movement. The pivot 13 of the lever 12 isalmost immediately below the rock-shaft 17, and on this account, inorder to permit the full movement of the upper arm of the lever 12 tothe left in the drawing, the said arm is curved, as aforesaid. Thisenables the upper end of the said curved arm to pass over and beyond therockshaft 17 to the position which is shown by dotted lines in thedrawing.` The extended sweep of the lever 12, which thereby ispermitted, causes the pivot connecting the upper arm of the lever 12with the extremity of the lever 15 to approach in the movement of thelever toward the dotted-line position more and more closely the lineconnecting the axis of the rock-shaft 17 and the axis ofthe pivot whichjoins the link 15 to the arm 16, thereby producing a toggle-like effect.The curved form of the links 11 and 15 gives ease and freedom, with anabsence from binding, to the movement of the parts, which conduces tothe attainment of the desired results.

The improved mechanical movement herein shown and described isapplicable to use in various connections and machines. One use for whichit is fitted is in connection with railway-crossing gates, but I do notlimit myself to such use.

What I claim is- 1. The combination with the actuating-lever 1, of thelink 11, the lever 12, the link 15, the arm 16, and the rock-shaft 17,all substantially as and for the purposes set forth,

2. The improved mechanical movement comprising in combination, theactuating hand-lever 1, having the recurved lower arm, the weightedcurved link 11 having one extremity thereof connected pivotally with thesaid curved lowerarm, the lever 12 having the other extremity of thelink 11 connected pivotally therewith and having also the curvedupwardly-extending arm, the curved link 15 having one extremity thereofconnected piv` otally with the said upper arm of the lever 12,

the arm 16 having the other extremity of the said link 15 connectedpivotally therewith, and the rock-shaft 17 having the said arm 16 madefast thereon, substantially as described. l In testimony whereof I affixmy signature in presence of two Witnesses.

WILLIAM MARTIN.

Witnesses:

WM. A. MAcLEoD, CHAs. F. RANDALL.

